It’s always interesting to read what smart people think of obesity and weight loss when they haven’t lived it. That sentence is not as sarcastic as it may sound, lol. I have lost about 70 pounds since 2017, but it wasn’t a straight shot - there were long plateaus, and periods of gaining weight, too. I have come to many different conclusions about what works and what doesn’t (for me), but I think you are onto something about those set points. Fast weight loss ALWAYS comes back. Losing weight slowly is healthy and sustainable, but it’s a lifelong endeavor.